JPS5826107B2 - Jikikiro Kuuchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a recording device that makes it possible to record information using a magnetic recording medium used in an information processing system, etc., particularly a magnetic disk device and a magnetic drum device, in an ideal environment. The present invention relates to a magnetic recording device that is operated.

Most conventional magnetic disks and magnetic drums use a metal substrate, and the surface of the metal substrate is treated and a magnetic recording layer is formed thereon by painting or plating.

In addition, when a protective film is formed on the magnetic recording layer,
There are cases where it is not formed.

High-density recording has also progressed in magnetic disks and magnetic drums, and now there are magnetic disks and magnetic drums that have recording densities five to ten times higher than the original.

In order to perform high-density recording, the thickness of the magnetic recording layer must be reduced, and the original thickness of the magnetic recording layer was 5.
Although the magnetic recording layer had a thickness of ~6 μm, a magnetic disk with a linear recording density 5 times that thickness had a magnetic recording layer thickness of 0.5 μm.
It is 7 to 0.9 μm.

When the magnetic recording layer was thick, the binding resin in the magnetic recording layer had the effect of protecting the underlying substrate, but when the thickness was 0.7 to 0.
When the thickness becomes 9 μm, this effect almost disappears.

Then, the underlying substrate rusts and the magnetic recording layer also rises, changing the height of the surface and causing accidents such as so-called head crashes in which the recording layer and the head come into contact.

In addition, not only the underlying material but also the surface of the magnetic recording layer itself is oxidized and deteriorated.

In coated magnetic disks, oxidation is prevented by cleaning the surface of the magnetic recording layer with isopropyl alcohol or the like.

In this case, if the magnetic recording layer is thick, there is almost no problem, but if the magnetic recording layer is thin, problems such as a decrease in output may occur.

Oxygen and moisture in the air are the main causes of rust on the underlying substrate and deterioration of the magnetic recording layer.

For this reason, some magnetic recording media have a protective film on the magnetic recording layer to prevent rust on the underlying substrate and deterioration of the magnetic recording layer.

However, this protective film also needs to be thick to a certain extent in order to effectively prevent rust and deterioration, and the distance between the magnetic head and the magnetic recording layer increases by the thickness of this protective film, making it possible to perform high-density recording due to air gap defects. It's getting harder.

Moisture in the air also interferes with the flight of the flying head.

In the case of high-density recording, the flying height of the flying head must also be reduced, but when the flying height becomes less than 1 μm,
Even when the humidity in the air was around 30%, moisture condensed on the butt of the flying head, interfering with stable flying, resulting in head crashes and data destruction.

To prevent this accident, the humidity in the air must be kept very low.

The purpose of the present invention is to prevent the deterioration of magnetic recording media by operating the magnetic recording media under a certain environment, and to stabilize the relationship between the magnetic head and the media, thereby achieving high performance that can be used for many years. An object of the present invention is to provide a density magnetic recording device.

In order to achieve the above object, a magnetic recording device according to the present invention uses a large-capacity magnetic recording medium, and includes an airtight container that operably houses at least the magnetic recording medium and the head assembly in the device. and an adjusting means for varying the volume of the airtight container, and a valve for changing the gas in the airtight container, the container is filled with a dry inert gas, and the pressure inside and outside the container changes depending on the operating environment. The adjusting means is configured to operate to make a difference.

With such a configuration, the object of the present invention is completely achieved.

The present invention will be explained in more detail below.

As mentioned above, the main causes of rust on the underlying substrate and deterioration of the magnetic recording layer are oxygen and moisture in the air, so theoretically this can be solved by making the magnetic recording device airtight and filling it with dry inert gas. .

Here, conceivable inert gases include helium, nitrogen, neon-argon, and other gases that do not corrode the underlying substrate and the magnetic recording layer, or gases that do not promote corrosion through the intervention of other substances.

However, making the entire device completely airtight is a practical problem, as it increases the weight and greatly increases the cost of the device.

Furthermore, maintenance is virtually impossible, and if an accident occurs, the device can no longer be used.

For the reasons mentioned above, it is virtually impossible to make the entire device completely airtight.

Although it is not a completely sealed structure, it is possible to form a sealed structure using an O-ring or a backing as a possible structure.

However, if the device is sealed with an O-ring or a backing, airtightness cannot be maintained if a pressure difference exists between the inside and outside of the device for a long time.

It is known that normally in a magnetic disk or magnetic drum device, during operation, the internal temperature of the device is as much as 20° C. higher than the outside temperature.

As a general method of using the equipment, if you set the conditions to start operation in the morning and stop operation at night, and calculate according to Boileux-Charles' law with an outside temperature of 20°C, approximately the internal volume of the equipment will be filled in one day. It can be seen that 6.5% of the volume of air is replaced with outside air.

As a result, approximately 45% of the air inside the device will be replaced in 10 days.

As a practical matter, this has little effect.

Therefore, even if the temperature rises, no pressure difference is generated.
The effect is achieved by providing a volume variable structure that changes the internal volume of the device so that no pressure difference occurs between the inside and outside.

It is sufficient for this variable range to be about 10% of the internal volume of the device.

As the volume variable structure, for example, a piston structure, a bellows structure, etc. can be used.

With a variable volume structure, even if the temperature rises, there will be no pressure difference between the inside and outside of the device, and outside air will only be mixed in by natural diffusion due to imperfections in the O-rings and gaskets.

With this device, it is possible to keep outside air infiltration within 5% for 3 months to 1 year.

Furthermore, by periodically replacing the air inside the device with dry inert gas using the device air exchange valve, it is possible to protect the magnetic device more effectively.

FIG. 1 is a diagram showing a first embodiment of the apparatus according to the present invention, in which FIG. 1a is a schematic front view and FIG. 1A is a side view.

This example device is an example applied to a magnetic drum device.

A magnetic drum 1 housed in a container 9 is rotated by a motor 3.

The magnetic head group 2 and the motor 3 are connected to a terminal 4 embedded in a terminal board 5, and external signals or power are exchanged with them via the terminal 4.

The terminal plate 5 is fixed to the container 9 via an O-ring 6.

The piston 7 is connected to three O-rings 6 provided in the container 9.
It is received by a piston receiving portion 10 having a diameter.

A hole 8 provided in the wall surface of the container 9 on which the piston 7 is housed is a through hole for maintaining one surface of the piston 7 at atmospheric pressure.

The valve 11 is provided to exchange the gas in the container with fresh dry inert gas.

In the device with the above configuration, since the piston 1 moves so as not to create a pressure difference between the inside and outside, the proportion of outside air getting mixed into the inside is significantly reduced, and even after one year of use, the mixing of outside air is only 5%. You can prevent it from reaching.

FIG. 2 shows a second embodiment of the apparatus according to the present invention, in which FIG. 2a is a schematic front view and FIG. 2A is a plan view.

This example device is an example applied to a case where a magnetic disk is used.

A magnetic disk 21 is housed in a cylindrical container 29 .

The magnetic disk 21 has a bearing 3 having three O-rings 26.
7, and the spindle 23 is rotated by a drive motor (not shown) outside the container.

The magnetic head 22 is supported by a cartridge 32.

A transmission rod 33 is coupled to the cartridge 32, and the transmission rod 33 is exposed to the outside via a bearing having an O-ring 34 provided on the wall of the container 29.

The head is moved radially relative to the disk 21 by externally manipulating the transmission rod 33.

The magnetic head 22 is connected to a connection terminal 24 planted on a connection plate 25, and the connection plate 25 is attached to a container 29 via an O-ring 26.

Signals from the head 22 are taken out to the outside via a connection terminal 24.

A bellows receiver 30 is provided above the container 29, and a bellows 27 is fixed to this receiver 30.

A bundle 35 is fixed to the upper side of the container, and a hole 28 is provided on the upper side of the bundle 35 and the container.

This hole is a hole for maintaining one side of the bellows 27 at atmospheric pressure.

In the embodiment shown above, the connection between the inner device and the outer device was performed electrically, but in this embodiment, there are connection parts such as the rotation of the spindle 230 and the movement of the connecting rod 33, so that the inner device and the outer device are connected electrically. The airtight condition is worse than in the previous embodiment.

After about 3 months, the amount of outside air will be reduced to about 5%.

Therefore, the dry inert gas is replaced once every three months using the valve 31.

As is clear from the above explanation, in the apparatus according to the present invention, the magnetic recording medium is always covered with a dry inert gas, so that the life of the magnetic recording apparatus can be extended 5 to 10 times that of the conventional apparatus.

Various modifications can be made to the embodiment apparatus described in detail above within the scope of the present invention, and the scope of the present invention extends to all of the claims.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of a magnetic device according to the present invention, in which FIG. 1a is a schematic front view and FIG. 1 is a side view. FIG. 2 is a diagram showing a second embodiment of the magnetic device according to the present invention, in which FIG. 2a is a schematic front view and FIG. 2A is a plan view. 1... Magnetic drum, 2... Magnetic head group, 3... Motor, 4... External connection terminal,
5...Terminal board, 6...O ring, 7.
...Piston, 8...Vent hole, 9...
... Container, 10... Piston receiving part, 11...
... Valve, 21 ... Magnetic disk, 22
...Magnetic head, 23 ...Spindle, 24 ...Signal connection terminal, 25 ...Connection plate, 26 ...0 ring, 27 ... Bellows 28 ... Ventilator L29 ... Container, 30 ... Bellows receiver, 31 ... Valve, 32 ...・Cartridge, 33...Transmission rod, 34...O-ring, 35...
・Handle, 36...board, 37...bearing.

Claims (1)

[Claims] 1. A magnetic recording device using a large-capacity magnetic recording medium, comprising: an airtight container for operatively accommodating at least a magnetic recording medium and a head assembly in the device; and an adjusting means for varying the volume of the airtight container. a valve for changing the gas in the airtight container, the container is filled with a dry inert gas, and the regulating means operates to adjust the pressure difference between the inside and outside of the container, which changes depending on the operating environment. A magnetic recording device configured in